Study of Impacts by Soil and Water Conservation on Environment in Yanhe River Basin of the Loess Plateau, China
Soil erosion is one of the important causes of land degradation. Many soil and water conservation practices have been implemented in order to decrease soil erosion and prevent land degradation for a long period in Yanhe River Basin which is characteristic of serious soil erosion for concentrated rainfall, erodible soil and hilly and gully terrain. Soil and water conservation practices can not only reduce soil and water loss but also change the situation of the land surface and influence the structure and functions of the eco-system. This study tried to put forward of the index of impacts by soil and water conservation on environment to quantitatively assess the impacts. The index was equal to 100 multiplied by percentage of ecological service value of the basin eco-system in the end state to the initial state of soil and water conservation and it was 100 if keeping the initial state. The larger the index was, the more the environment quality improved if not considering other factors. It could be calculated using the data of precipitation, soil, terrain and soil and water conservation practice with the guidance of the theory of soil and water conservation science and science of ecological economics based on GIS. For the study area the ecological service value of eco-system was 13.693 billion and 24.464 billion RMB respectively in 1997 and 2006 in the initial state of soil and water conservation while was 14.264 and 25.620 billion RMB in the end state. The index of impacts on environment was 106.55 and 110.24 in 1997 and 2006 and soil and water conservation improved the quality of environment.
impacts on environment by soil and water conservation value of ecological service Yanhe River Basin
Hongxia Xie Rui Li Qinke Yang Jiannan Duan
College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China Institute of Soil and Water Conservation, NWUAF,Chinese Academy of Sciences & Ministry of Water Reso
国际会议
西安
英文
895-901
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）